The main difference between these two cards are the way they're processed, Visa Debit uses the former Delta network (whenever you see the Delta sign, it means that Visa Debit is accepted there as well because existing systems have not yet been updated to accept the card natively as if it were any other Visa card) whilst Visa Electron uses a separate network, so look out for differences in signage because when you see the plain-old Visa sign, it doesn't necessarily mean that Visa Electron is accepted there